Observation of the Ciliary Movement of Choroid Plexus Epithelial Cells Ex Vivo

The overall goal of the following experiment is to analyze the motion of choroid Plexus epithelial cell, Celia ex vivo. This is achieved by first excising the brain from a mouse embryo or pup to isolate the choroid plexus tissue. The mo ciliary movement is visualized by differential interference contrast, or DIC microscopy, and then a digital movie of the ciliary tips is acquired for manual tracking of the ciliary tip positions.

Ultimately, the reconstituted tip movements of the Celia are categorized and quantified based on the patterns of their motions. This method can help answer key questions in cell biology, such as How is Celia mortality controlled during development, and how does pattern of mobility change over time? The Implication of these techniques extent was path physiological analysis and diagnosis.

Syria associated diseases as our fundamental understandings of kinetic Syria is still spurs. Begin by placing a 70%ethanol rinsed neonatal mouse, head in ice cold liebovitz L 15, medium in a sterile 10 centimeter dish immediately after decapitation. Next, use a pair of watchmaker forceps to remove the scalp from the skull.

Then cut open the skull by median section along the longitudinal suture to expose the brain, followed by cutting of the cranial nerves to harvest the whole organ. Transfer the isolated brain into a new dish filled with fresh ice, cold medium, with the dorsal aspect facing up and place the dish under a stereo microscope. Then orient the tissue so that the olfactory bulbs are positioned at three o'clock, and grasp the brain gently with the watchmaker forceps.

With the other hand, use fine dissection forceps to cut the cerebral poons connecting the cerebral hemispheres to the cerebral trunk. Pinch out the Dion Cephalon to further separate the hemispheres and place the cut surface facing up, followed by pulling on the lamina afia to remove the lateral ventricular choroid plexus attached to the lateral side of the hippocampus. When the choroid plexus has been isolated, transfer the tissue to a 35 millimeter glass bottom dish containing fresh medium, and position a weight on the tissue to gently hold it in place within 25 to 60 minutes of the euthanasia, begin the live imaging of the choroid plexus epithelial cell Celia, by adjusting the focus of the objective lens by eye.

Adjust the condenser so that the center and focus conform to the Kula illumination. Then insert the appropriate optical elements into the light path to conform to the DIC optics. Move the DIC prism to adjust the contrast of the images to a position where the surface structure of the tissue will be clearly recognized.

Then switch the light path to the video camera and increase the light power. With the removal of the neutral density filters, adjust a field of observation and focus, setting the temporal resolution of the video camera to 200 hertz and the exposure time to 0.1 milliseconds for the desired imaging period. Then acquire the images after the image stack has been obtained, each single frame will display a clear image of Celia to manually track the beating patterns of each cilium.

Use the mouse pointer to mark the position of the ciliary tips in each frame. Then using the appropriate software, analyze the trajectory data and classify the trajectories into one of two modes of motion back and forth or rotational by eye. Using the formula, calculate the ciliary beating frequency for multiple ciliary beating cycles.

As other Celia on the same cell can interfere with the motion of each cilium. Next, to analyze the angular uniformity of the ciliary beating axes within a single cell. For the back and forth trajectories fit the positions of the Celia tips to a straight line defining theta as the angle the line makes with the X axis.

For the rotational trajectories fit the positions to an ellipse defining theta as the angle the major axis of the ellipse makes with the x axis. Finally, for a quantitative description of each trajectory, rotate the trajectories by theta defining their aspect ratios as the ratios between the widths of their distribution along the x and y axis. In this first clip, a top view of the choroid plexus epithelial cells with Celia from a postnatal day two mouse pup imaged by high speed video microscopy is shown the irregular surface of the choroid plexus tissue makes it visible both in the in-focus and out of focus planes.

In this second clip, a magnified view of the boxed area from the previous movie is shown, enabling a closer observation of the rotational and back and forth movements exhibited by the individual cilium. Here the trajectories of representative ciliary tip movements reconstituted from movie records over multiple cycles are presented with the time courses of the x and y coordinates of the tip positions plotted in the graphs. To demonstrate a phase shift between the two coordinates in these graphs, the x and Y coordinates were normalized and overlaid.

While motile CLIA are readily recognized by live imaging, it is not easy to identify the non motile CLIA by this method. To overcome this difficulty, scanning electron microscopy can be indispensable for obtaining whole images of the clia regardless of their motility. While attempting this procedure, it is important to remember to perform the dissection promptly enough that the freshness of the sample is preserved and the motility of Syria is maintained.

After watching this video, you should have a good understanding how to prepare tissue samples with viral cereal, as well as how to monitor and quantify mortality of the CX vivo.